Get the list of flag reasons a review site accepts, in that site's own words. Use this before flagging so you can offer the right reasons in your UI and submit one the site will recognize. Leave out review_site_id to get the reasons for every site, grouped by site. Returns each reason with its identifier and full description. You'll pass the identifier when you flag.

Prerequisites: a bearer token. Optional: the review site's id (review_site_id).

Authentication: Partner or Account token. The reason list is the same for every caller; it isn't tied to an account.

Rate limit: none.